As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TROUBLESHOOTING BY MAINTENANCE FOR A HARD STARTING RT ENGINE, MAINTENACE FOUND ONE ENTIRE SIDE OF MAGNETO CAP FRACTURED AWAY. 2 SIDEWALL PIECES FOUND IN AFT LOWER COWLING. UNABLE TO DETERMINE CAUSE. MAGNETO PRESSURIZATION VALVE AND SYS CHECKED SERVICEABLE. MAGNETO ASSY. REPLACED.